Observation of the decays χcJ → $$ {\mathrm{nK}}_{\mathrm{S}}^0\overline{\Lambda} $$ + c.c.
Observation of the decays χcJ → $$ {\mathrm{nK}}_{\mathrm{S}}^0\overline{\Lambda} $$ + c.c.
By analyzing $4.48\times10^8$ $\psi(3686)$ events collected with the BESIII detector, we observe the decays $\chi_{cJ} \to n K^0_S\bar\Lambda + c.c.$ ($J=0$, 1, 2) for the first time, via the radiative transition $\psi(3686) \to \gamma \chi_{cJ}$. The branching fractions are determined to be $(6.67 \pm 0.26_{\rm stat} \pm 0.41_{\rm syst})\times10^{-4}$, $(1.71 …